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基金主要投资于有价证券，投资选择灵活多样，从而使基金的收益有可能高于债券，投资风险又可能小于股票。 ( )
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[听力原文]11-15Miss Yang from China worked as a secretary in a Canadian company. She became friendly with one of the Canadian secretaries, a woman named Cathy Lane. The two usually ate lunch together and Yang often asked Cathy for advice on problems she faced about Canadian society. Cathy gave her a lot of advice and helped her move from one apartment to another. Yang visited Cathy several times at home but she did not invite Cathy to her apartment, because she shared it with four other people. If they did not see each other over the weekend, they usually talked on the telephone.However, recently something seemed to be going wrong. Cathy seemed to be getting impatient. She started going out by herself at lunchtime instead of eating with Yang, and she seemed unwilling to answer questions. Yang was puzzled. She couldn’ t imagine what the problem was. Where did Cathy come fromShe came from（）.
若已知a=10、b=20，则表达式!a＜b的值为______。
[听力原文]W: Jack, did you hear about the second -hand ear that Mike boughtM: Yes, and Tom said that they got a very good deal on it. What do we learn from this conversation（）
What is the man’s nationality(国籍)
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